U.S. History: Biographies
- Newton D. Baker
- Newton Diehl Baker
- Nicholas Biddle
- Nicholas Philip Trist
- Norman Mattoon Thomas
- Norman Y. Mineta
- Ogden Livingston Mills
- Oliver Ames
- Oliver Ellsworth
- Oliver Hazard Perry
- Oliver Laurence North
- Oliver Otis Howard
- Oliver Perry Morton
- Oliver Wolcott
- Omar Nelson Bradley
- Orval Faubus
- Orville Hickman Browning
- Oscar McKinley Charleston
- Oveta Culp Hobby
- Paris Gibson